In various underground projects, there are generally complex geological conditions such as weak surrounding rock, fault fracture zone, high ground stress and large deformation, which bring great difficulties to rock anchor construction, especially in the case of severe hole collapse and the need for extra long bolts. In this case, the universal anchor is powerless. The self-drilling anchor rod integrates the functions of drilling, grouting and anchoring. It can improve the surrounding rock well in the advance support of tunnels, various slope treatments, high ground stress and large deformation and other disease remediation projects, and achieve ideal support effect.
1) Spherical nut: it can transfer the concentrated stress of surrounding rock to the backing plate.
2) Arched backing plate: can bear greater stress of surrounding rock.
3) Stopper: keep the grouting at a certain pressure to fully fill the gaps in the surrounding rock.
4) Anchor body: full-length international standard wave connection thread, easy to install drill bit, coupling sleeve, fastening nut; and can be cut and connected to lengthen arbitrarily.
5) Coupling sleeve: enable the anchor rod to be extended to the designed depth while drilling.
6) Drill bit: With strong penetrating power, the bolt can pass through various rocks.
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PRODUCT PARAMETERS
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Type
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Outer Dia(mm)
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Inner Dia(mm)
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thickness(mm)
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Ultimate(KN) load
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Yield Load(KN)
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Weight(Kg/m)
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R25N
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25
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14
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5.5
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200
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150
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2.3
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R32L
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32
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21.5
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5.25
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210
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1600
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2.8
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|||
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R32N
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32
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16
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8
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360
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280
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3.4
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|||
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R32S
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32
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16
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8
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360
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280
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4.1
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R38
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38
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17/19/22
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10.5/9.5/8
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450/400/350
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550/500/420
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6.3/5.9/5.2
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R51
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51
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29/33/35
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11/9/8
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800/660/550
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640/540/450
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9/7.7/7
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T76N
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76
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51
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12.5
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1600
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1200
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15
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T76S
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76
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45
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15.5
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1900
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1500
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19.7
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T103N
|
103
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78
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12.5
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2282
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1800
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27.3
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T103S
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103
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51
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26
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3460
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2750
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42
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T30/11
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30
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11
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9.5
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320
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260
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3.1
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T30/14
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30
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14
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8
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260
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220
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2.8
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|||
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T30/16
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30
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15
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7.5
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220
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180
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2.7
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T40/16
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40
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16
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12
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660
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525
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7
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T40/20
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40
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22
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9
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539
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430
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5.6
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T52/26
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52
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26
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13
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929
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730
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10
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|||
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T73/53
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73
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53
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10
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1630
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970
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12.3
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|||
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T73/56
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73
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56
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8.5
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1414
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785
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11
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|||
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T73/45
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72
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45
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14
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1630
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1180
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17.8
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T130/60
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130
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60
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35
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7940
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5250
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75
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The self-drilling bolt adopts good thick-walled seamless steel pipe material, perfect and fast surface thread forming process and well-made accessories, which truly realize the unity of drilling, grouting, anchoring and other functions of the self-drilling bolt.
1) There is a drill bit with strong penetrating power in front of the bolt, which can easily penetrate all kinds of rocks under the action of general rock drilling machinery.
2) The anchor rod has a continuous international standard wave thread, which can be used as a drill rod with a drill bit to complete drilling into an anchor hole.
3) The bolt body as a drill pipe does not need to be pulled out, and its hollow can be used as a grouting channel for grouting from inside to outside.
4) The high-efficiency grout stopper enables the grouting to maintain a strong grouting pressure, fully fills the gap, and fixes the broken rock mass. The high-strength backing plate and nut can evenly transfer the stress of the deep surrounding rock to the surrounding wall. , to achieve the purpose of supporting each other between the surrounding rock and the bolt.
5) The high-strength coupling sleeve processed by mechanical cutting technology makes the self-drilling bolt have the characteristics of lengthening while drilling, making it suitable for relatively narrow construction space and realizing the design idea of strengthening the surrounding rock with extra-long bolts .
6) Due to the three-in-one function of the anchor rod, when it is constructed under various surrounding rock conditions, it can form anchor holes and ensure the effect of anchoring and grouting without special methods such as casing wall protection and pre-grouting.
